Constant-Depth Scratch Test for the Quantification of Interfacial Shear Strength at Film-Substrate Interfaces
Lascurain, David P.
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A Constant-Depth Scratch Test (CDST) technique to quantitatively determine the shear strength of interfaces between thin metallic or non-metallic films and metal or ceramic substrates is revealed. The test overcomes two problems associated with other types of scratch tests, namely the instrumental complexity required for real-time detection of interfacial failure, and the inability to quantify interfacial strength. These problems are circumvented by maintaining a constant depth during scratching through the coating and the substrate, monitoring the horizontal and vertical forces to sustain the constant depth scratch, and finally by using a model to analyze the test results to quantify the interfacial shear strength. Unlike other scratch tests, this test is capable of measuring interfacial shear strength as a function of position on the film-substrate sample.
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Campbell, John C. (Monterey, California. Naval Postgraduate School, 1994-12);By using a constant depth scratch test, the interfaces shear strength of various thin film/substrate interfaces can be determined. The ability to quantitatively ascertain when thin film debonding occurs has become especially ...
Secor, E. Daniel. (Monterey, California. Naval Postgraduate School, 1994-03);This thesis reviews the development of the constant-depth Scratch Test for determining the adhesive shear strength of thin film-substrate interfaces, and proposes refinements to the theoretical ...
Peterson, Keith A. (Monterey, California. Naval Postgraduate School, 2002., 2002-09);In many applications, large shear stresses develop at interfaces between dissimilar materials during thermo-mechanical excursions, when there is a significant difference in the coefficient of thermal expansion between them. ...